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[Ada] Special cross references in ALFA mode for constants and formals

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Yannick Moy <moy at adacore dot com>
Date: Thu, 4 Aug 2011 09:55:11 -0400
Subject: [Ada] Special cross references in ALFA mode for constants and formals

ALFA mode used for formal verification requires different cross references,
in which read of constants is absent, and formal is not referenced when used
as selector of parameter association.

Tested on x86_64-pc-linux-gnu, committed on trunk

2011-08-04  Yannick Moy  <moy@adacore.com>

	* lib-xref-alfa.adb (Is_Global_Constant): new function that detects
	library-level constant.
	(Add_ALFA_Xrefs): ignore global constants in ALFA xref.
	* sem_res.adb (Resolve_Actuals): do not add cross-reference to Formal
	used as selector of parameter association, in ALFA mode.

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